Water drop power generation device and power generation method based on multi-liquid-drop cooperative movement

Abstract

The invention discloses a water drop power generation device and a power generation method based on multi-liquid drop cooperative motion, and relates to the field of water photovoltaic power generation, the device comprises a tubular water drop power generator and a liquid drop driving device, and through reciprocating motion of liquid drops in a tube, charge exchange and electrostatic induction are carried out to generate electric energy; the electric energy output is obviously improved through the synergistic effect of a plurality of liquid drops; experimental data show that when the double liquid drops work cooperatively, the peak voltage of the power generation device can reach-730 V; under the configuration of more liquid drops, the peak value of the output voltage is up to-1.2 kV or even higher and is improved by several times compared with a single-liquid-drop working mode; the device can directly ionize air to realize nitrogen fixation and generate nitrogen oxide (NO), and is expected to be used for nitrogen fertilizer production.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrovoltaic power generation and droplet energy harvesting, and particularly relates to a water droplet power generation device based on the cooperative movement of multiple droplets and a power generation method based on this device. Background Art

[0002] The hydrovoltaic effect is an emerging technology for generating electricity through the direct interaction between materials and various forms of water (such as raindrops, waves, rivers, evaporation, moisture, etc.). Hydrovoltaic power generation refers to an emerging technology that utilizes the potential energy in various forms of water in the environment to obtain electricity. Its principle is based on the movement of the double-layer boundary at the interface between water and solid materials, which induces the directional movement of carriers, thereby converting water energy into electrical energy.

[0003] Currently, the research on the hydrovoltaic effect mainly focuses on the development of various hydrovoltaic-based power generation devices. Existing droplet power generation devices mainly rely on the friction or impact of a single droplet with a solid surface to generate electricity, with limited output voltage (usually below 500V), and lack effective strategies to further increase the output voltage. Therefore, traditional droplet generators are difficult to achieve high-voltage output, which limits their applications in high-voltage scenarios such as air ionization and nitrogen fixation. In addition, traditional solid-solid friction generators suffer from severe material wear and have a low service life. Therefore, how to increase the output voltage of droplet generators has become an urgent technical problem in this field. Summary of the Invention

[0004] In response to the problem of limited output voltage of existing droplet generators, the present application provides a water droplet power generation device based on the cooperative movement of multiple droplets, which improves the power generation efficiency through the cooperative movement mechanism of multiple droplets and extends the service life of the device at the same time.

[0005] Specifically, the above-mentioned invention objective is achieved through the following technical solutions: First of all, the present application provides a water droplet power generation device based on the cooperative movement of multiple droplets, including a tubular water droplet generator and a droplet driving device; the tubular droplet generator includes a hollow dielectric tube, and the droplet / droplet group can slide inside the dielectric tube; the outer electrode is wrapped around the middle of the outer surface of the dielectric tube; through holes are provided on the outer surface of the dielectric tube near the outer electrode, one end of the electrode is connected to the outer electrode, and the other end passes through the through hole and is connected to the inner electrode arranged inside the dielectric tube; one end of the droplet driving device is hermetically connected to the dielectric tube and can control the air pressure inside the dielectric tube. The above-mentioned inner electrode is close to the inner wall of the dielectric tube (distance < 2mm) to ensure that it does not affect the sliding of the droplet, and at the same time enables the droplet to fully contact the outer electrode coverage area when it touches the inner electrode, thereby realizing more charge transfer.

[0006] In one embodiment of the present application, the above-mentioned droplet driving device includes a driving module and a syringe; the syringe consists of a barrel and a piston rod. The barrel is fixed to the tabletop, and its top is provided with a connector, which is hermetically connected to the dielectric tube; the piston rod can move on the inner wall of the barrel and its end is connected to the driving module; the driving module drives the piston rod to reciprocate, thereby controlling the air pressure in the dielectric tube. Further, the above-mentioned driving module includes a controller, a stepper motor, and a slide rail; wherein, the controller is connected to the stepper motor through a wire (such as an enameled silver-plated wire), the slide rail is provided on the upper surface of the stepper motor, the lead screw of the stepper motor can drive the slide to reciprocate along the slide rail, and the slide is fixedly connected to the piston rod, thereby driving the piston rod to slide inside the barrel, and further controlling the air pressure in the dielectric tube.

[0007] In specific implementation, other conventional driving devices can also be used as the droplet driving device, such as a micro-injection pump, an injection pusher, an airbag, etc. These devices can all control the air pressure in the dielectric, drive the droplets to reciprocate, and achieve the purpose of the invention.

[0008] Preferably, the distance between the outer electrode and the through hole is 1-2 mm.

[0009] Preferably, the above-mentioned inner electrode is a metal electrode, and the material of electrode 10 is a wire, such as an enameled silver-plated wire with a wire diameter of 0.43 mm.

[0010] Preferably, the above-mentioned sealed connection means that one end of the dielectric tube is hermetically connected to the connector at the end of the syringe through a silicone tube.

[0011] Preferably, the material of the dielectric tube is perfluoroethylene propylene.

[0012] Preferably, the outer electrode is a copper tape with a thickness of 0.06 mm and a width of 6 mm.

[0013] Secondly, the present application also provides a method for using the above-mentioned water droplet power generation device based on the cooperative movement of multiple droplets, that is, injecting droplets or a group of droplets into the dielectric tube, starting the droplet driving device to control the air pressure in the dielectric tube, and pushing the droplets or the group of droplets to slide in the dielectric tube; during the sliding process, the droplets or the group of droplets exchange charges and generate electrostatic induction with the inner wall of the dielectric tube and the outer electrode, generating electric energy; when the last droplet contacts the inner electrode, the droplet driving device changes the air pressure to control the droplets or the group of droplets to return to the initial position, completing one power generation process; the whole process repeats continuously to continuously generate electric energy.

[0014] Preferably, the above-mentioned droplet length is equal to the length of the external electrode. The droplet group consists of at least two spatially separated droplets, and voltage output is achieved through cooperative movement and charge exchange with the inner wall of the dielectric tube and the electrode.

[0015] This application first proposes a new power generation mode of collaborative multi-droplet sliding in a tube. Taking the simplest double-droplet mode as an example, when the first droplet touches the inner electrode, the charge it carries is immediately transferred to the outer electrode. As it contacts the inner electrode and moves to the left, due to the high electron affinity of polytetrafluoroethylene-propylene, negative charges will remain on the tube wall, causing positive charges to gradually transfer to the outer electrode. When the second droplet enters the area covered by the outer electrode, as it moves, it connects the negatively charged solid surface to the inner electrode. Through electrostatic induction, the previously accumulated charges are instantaneously transferred from the outer electrode to the droplet, generating a negative-polarity pulse signal. Experimental results show that compared with other devices for droplet power generation in a dielectric tube, in this mode of power generation by the collaborative movement of a droplet group, the device has equally stable and more remarkable output performance. Compared with existing droplet power generation devices, this application has the following technical effects: 1. The power generation device of this application has a simple design. Since polytetrafluoroethylene-propylene itself has strong hydrophobicity, after cleaning the inner wall of the tube with alcohol, water droplets can slide freely in the tube, quickly contact and separate from the electrodes, realizing instantaneous charge transfer.

[0016] 2. In the power generation process of this application, the droplets can be reused without continuous water supply, and only gentle reciprocating movement of water droplets is required during power generation to achieve high-voltage output.

[0017] By changing the electrode length, optimizing the number of droplets, arrangement order, and droplet length of the droplet group, the power generation device of this application can achieve a high-voltage output of nearly 2 kV without changing the droplet movement speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will further illustrate the concept, specific structure, and technical effects of the present invention with reference to the drawings, so as to fully understand the purpose, features, and effects of the present invention.

[0019] Figure 1 Schematic diagram of a water droplet power generation device based on the collaborative movement of multi-droplets according to the present invention; Figure 2 Schematic diagram of the droplet drive system; Figure 3 Schematic diagram of the water droplet power generation device (illustrated as double-droplets); Figure 4 Voltage signal stably output for a long time during the collaborative movement of double-droplets (outer electrode 8 and droplet length of 6 cm) of the water droplet power generation device;

[0020] Figure 5 Schematic diagram of the optimized collaborative movement of multi-droplets; Figure 6 Ultra-high voltage signal output during the collaborative movement of optimized multi-droplets (outer electrode 8 with a length of 6 cm) of the water droplet power generation device; Figure 7 Physical diagram of the water-drop power generator based on the collaborative movement of multiple droplets prepared for the embodiment.

[0021] In the figure, 1 - controller, 2 - stepping motor, 3 - slide guide rail, 4 - slide, 5 - cylinder, 6 - silicone tube, 7 - dielectric tube, 8 - outer electrode, 9 - inner electrode, 10 - electrode, 11 - droplet, 12 - piston rod, 13 - joint, 14 - through hole, 15 - droplet driving device. Detailed implementation manners

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] The present invention will be further described by way of examples in conjunction with the following drawings. Unless otherwise specified, all structural components involved in the embodiments are obtained through commercial channels.

[0024] The drive module involved in the embodiment is purchased from Bozhong Technology Transmission. The model of the stepping motor is HBX - 28, and the model of the controller is HJ - 03A; The syringe has a capacity of 50 mL and is purchased from Kefu Company; The wire is an enameled silver-plated wire with a wire diameter of 0.43 mm and is purchased from Shenzhen Qianglisheng Electric Wire; The dielectric tube is a perfluoroalkoxy alkane tube with an inner diameter of 4 mm and an outer diameter of 6 mm, and is purchased from Gefang Company; The outer electrode is made of copper tape with a thickness of 0.06 mm and a width of 6 cm, and is purchased from Youbisheng Company. Embodiment 1

[0025] In this embodiment, the structure of the water-drop power generator based on the collaborative movement of multiple droplets is as Figure 1 shown. The power generator includes a tubular water-drop generator and a droplet driving device 15, Figure 1 The direction indicated by the arrow in the figure is the droplet movement direction.

[0026] As Figure 2As shown in the figure, the droplet driving device 15 in this embodiment includes a driving module, a syringe barrel 5, a piston rod 12, and a connector 13. The driving module includes a controller 1, a stepping motor 2, and a slide rail 3. The controller 1 is connected to the stepping motor 2 through a wire and controls the stepping motor 2 (using a circuit). The slide rail 3 is fixedly arranged on the surface of the stepping motor 2. The stepping motor 2 drives the slide 4 to reciprocate along the slide rail 3 through a lead screw. The syringe is composed of a barrel 5 and a piston rod 12 that can move along the inner wall of the barrel. A connector 13 is provided at the top of the barrel 5. In this embodiment, the barrel 5 is fixed to the desktop through an acrylic bracket (in specific implementation, it can also be fixed in other ways). One end of the piston rod 12 is fixedly connected to the slide 4. When the slide 4 slides along the rail, it can drive the piston rod 12 to reciprocate inside the inner wall of the barrel 5.

[0027] As Figure 3 shown, the tubular droplet generator includes a hollow dielectric tube 7; an outer electrode 8 is wrapped around the outer surface of the middle part of the dielectric tube 7. Through holes 14 are provided on the surface of the dielectric tube 7 near the outer electrode 8. In this embodiment, the distance from the through hole 14 to the outer electrode 8 is 2 mm (in specific implementation, within the range of 1 - 2 mm for this distance, the purpose of the invention can be achieved). One end of the electrode 10 is connected to the outer electrode 8, and the other end passes through the through hole 14 and is connected to the inner electrode 9. In this embodiment, the material of the electrode 10 is a wire, which extends 2 mm into the through hole 14 (to ensure that the droplet will not break when passing through due to excessive extension of the electrode), and the outer skin of this part is peeled off to form the inner electrode 9 (in specific implementation, a metal electrode that does not affect the sliding of the water droplet can also be arranged inside the dielectric tube 7. After being connected to the electrode 10, it can be used as the inner electrode 9). One end of the dielectric tube 7 is connected to the connector 13 at the end of the syringe through an ordinary silicone tube 6 (to achieve a sealing effect). When the driving module drives the piston rod 12 to reciprocate inside the inner wall of the barrel 5, the air pressure inside the dielectric tube 7 can be controlled through the connector 13. In this embodiment, an oscilloscope is also provided on the electrode 10.

[0028] Figure 7 It is a schematic diagram of the device structure prepared in this embodiment, where a is a photo of the overall water droplet power generation device, and b and c are physical photos of the droplet driving device and the dielectric tube respectively.

[0029] Unless otherwise specified, the droplets 11 used in this embodiment are all conventional municipal water (tap water).

[0030] The specific working process of this device is as follows: The droplet 11 is injected from one side of the opening of the dielectric tube 7, and the droplet driving device 15 is started to control the voltage in the dielectric tube 7: Specifically, in this embodiment, after the controller 1 receives the start command, the stepper motor 2 starts to work, driving the slide 4 and the piston rod 12 to move smoothly along the guide rail and reciprocate in the cylinder 5, and the air pressure in the dielectric tube 7 is controlled by the joint 13, pushing the droplet 11 to slide in the dielectric tube 7; with the push of the piston rod 12, the droplet slides smoothly in the dielectric tube 7; during the sliding process, the droplet 11 exchanges charges and undergoes electrostatic induction with the inner wall of the dielectric tube 7 and the outer electrode 8, thereby generating electrical energy; when the droplet finally contacts the inner electrode 9, the controller 1 issues a command to reverse the stepper motor 2, driving the slide 4 and the piston rod 12 in the syringe back to the initial position, and the droplet driving device 15 drives the droplet 11 back to the initial position by changing the air pressure in the dielectric tube 7. The whole process is repeated, and electrical energy is continuously generated.

[0031] In this embodiment, the stepper motor 2 receives instructions through the control system and rotates at a predetermined step size and speed, thereby driving the droplets in the tubular droplet generator to reciprocate through the transmission mechanism; the controller 1 pre-sets the stepper motor 2 speed, step size and intermittent time, etc., which are converted into the moving speed, moving distance and residence time of the droplets, ultimately achieving precise control of the droplet movement.

[0032] In this embodiment, the length of the droplets at both ends of the droplet group 11 is the same as the length of the outer electrode 8, both of which are 6 cm, the droplet spacing is 1 cm, and the droplet moving speed is 16 cm∙s -1 Move the first droplet to outside the coverage area of the outer electrode 8, pre-set the step length on the controller 1, start the controller 1, so that the droplet group 11 stops when the last droplet just touches the inner electrode 9, and then control it to return to the starting position to complete a reciprocating motion. In this embodiment, the reciprocating time is 4.5s. In specific applications, the reciprocating time can be set according to actual needs.

[0033] The performance of the power generation device prepared in this embodiment was further tested. The positive and negative electrodes were connected to an oscilloscope (SIGLENT, SDS2352X Plus) equipped with a highly attenuated ð100 MΩÞ probe. In the electrical signal generated in this embodiment, the outer electrode 8 is the negative electrode and the inner electrode 9 is the positive electrode. The voltage detection results are shown in FIG. Figure 4 As shown. Figure 4 It can be seen that in the dual-droplet mode, the device can achieve an instantaneous voltage output of nearly -750V and can last for nearly 2 hours without significant attenuation.

[0034] like Figure 5As shown, continue to select a 6-cm-wide copper tape as the outer electrode 8. Correspondingly, the length of the droplets 11 at both ends of the droplet group is also 6 cm. Add 5 droplets of 1 cm between the 6-cm droplets at both ends, and the droplet spacing is 1 cm. These 1-cm droplets effectively carry positive charges to the electrode, thereby increasing the negative charges on the inner wall of the tube. Perform performance tests on this power generation device. The positive and negative electrodes are respectively connected to an oscilloscope (SIGLENT, SDS2352XPlus) equipped with a highly attenuated (100 MΩ) probe, as Figure 6 shown. Finally, the peak voltage of the 6-cm droplets reached 1.2 kV under the synergistic effect of multiple small droplets, indicating its potential in the field of high-voltage discharge.

[0035] In this embodiment, by reasonably designing the droplets / droplet group, the ability of the water droplet power generation device based on the cooperative movement of multiple droplets to output stably for a long time is first verified, and then it is proved that its voltage output can be increased to the kilovolt level.

[0036] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water droplet power generation device based on the cooperative movement of multiple droplets, characterized in that, The electric generator device includes a tubular water droplet generator and a droplet driving device; The tubular droplet generator includes a hollow dielectric tube, and an outer electrode is wrapped around the middle of the outer surface of the dielectric tube; through holes are provided on the outer surface of the dielectric tube near the outer electrode, one end of the electrode is connected to the outer electrode, and one end passes through the through hole and is connected to the inner electrode arranged inside the dielectric tube; The droplet driving device is connected to one end of the dielectric tube and can control the air pressure inside the dielectric tube.

2. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 1, wherein The droplet driving device includes a driving module, a cylinder body and a piston rod; a joint is provided at the top of the cylinder body and is connected to the end of the dielectric tube; the driving module is connected to the piston rod and drives the piston rod to reciprocate on the inner wall of the cylinder body, thereby controlling the air pressure inside the dielectric tube.

3. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 1, characterized in that, The inner electrode is a metal electrode, and the distance between it and the inner wall of the dielectric tube is <2 mm.

4. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 1, wherein The distance between the outer electrode and the through hole is 1-2 mm.

5. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 1, characterized in that, The material of the dielectric tube is perfluoroethylene propylene.

6. The water-drop power generation device based on the cooperative movement of multiple droplets according to claim 1, characterized in that, The outer electrode is a copper tape.

7. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 2, wherein The driving module includes a controller, a stepping motor, a slide table and a slide table guide rail; wherein, the controller is connected to the stepping motor with a slide table guide rail on its surface through a wire, the stepping motor drives the slide table to reciprocate along the slide table guide rail, and the slide table is connected to the end of the piston rod.

8. The water droplet power generation device based on the cooperative movement of multiple droplets according to claim 7, wherein The connection to the end of the dielectric tube means that one end of the dielectric tube is hermetically connected to the joint through a silicone tube.

9. The power generation method of the water droplet power generator based on the cooperative movement of multiple droplets according to any one of claims 1-8, characterized in that The steps are as follows: inject droplets or a group of droplets into the dielectric tube, turn on the droplet driving device and control the air pressure inside the dielectric tube, push the droplets or the group of droplets to slide in the dielectric tube to generate electric energy; when the droplets contact the inner electrode, the droplet driving device changes the air pressure inside the dielectric tube, and the droplets or the group of droplets return to the initial position to complete one power generation process; the group of droplets is composed of at least two spatially separated droplets.

10. The power generation method according to claim 9, characterized in that, The length of the droplet is the same as the length of the outer electrode.

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